Realm Server Joining after reverting

What I expected to happen was...:
Upon a revert of 30 minutes prior everyone would be able to join...

What actually happened was...

Upon reverting the world 30 minutes ago [Had someone grief] no one is able to join back including myself [host]...

Steps to Reproduce:
1.  Open Realm and have people join...
2. Revert back 30 minutes...
3. Replace current world file with download of old world file...

4.  Try to open the world and you will get locked in loading screen...